Gold cyanidation

Gold cyanidation (also known as the cyanide process or the MacArthur–Forrest process) is a hydrometallurgical technique for extracting gold from low-grade ore by converting the gold to a water-soluble coordination complex. It is the most commonly used leaching process for gold extraction. [1]A simulation-based life cycle assessment was conducted to compare the impacts of different cyanide-free chloride processing routes for refractory ores to determine whether one-stage leaching of gold from the ores could be advantageous over chloride leaching after conventional pressure oxidation from an environmental perspective.Direct Cupric Chloride Leaching of Gold from Refractory Sulfide Ore ...The stoichiometry by which this reaction occurs is known as the Elsner (1846) equation. 4Au + 8CN- + O2 + 2H20 --> 4Au (CN)~ + 4OH- (1) In this century a large proportion of the gold processed will be recovered from sulfide ores. Since the sulfide minerals are to some extent soluble in cyanide solutions, there will always be some sulfur species ...The cyanide leaching of gold in solutions containing sulfideاحصل على السعر

(PDF) Leaching of gold ores with high cyanicides: a ... - ResearchGate

Article. The concept of leaching copper–gold ores using leach solutions which contain Cu (CN)32− was investigated. Gold leaching occurs in air saturated Cu (CN)32− solutions at a much slower ...Most gold deposits occur associated with sulphides like pyrite and arsenopyrite; thus, precious metal dissolution is possible by oxidizing auriferous sulfide concentrate using simultaneous pressure oxidation and cyanidation.Minerals | Free Full-Text | Gold Extraction from a Refractory Sulfide ...The ability of acidic chloride solutions to dissolve gold and refractory sulfides simultaneously has been recognized as potential advantage of gold leaching (Lundström et al. 2015; Miettinen et al. 2013), but this has been demonstrated in onlyDirect Cupric Chloride Leaching of Gold from Refractory Sulfide Ore ...احصل على السعر

Simultaneous sulfide oxidation and gold dissolution by cyanide-free ...

The chloride (chloride-bromide) solution presents an alternative cyanide-free media, which is able not only to leach gold-bearing sulfide minerals, but also gold, in a single unit process.The ongoing depletion of gold and silver-containing ore deposits demands a shift towards the processing of more complex sources. Leaching of gold or silver from these sources, which are named refractory and are typically low-grade, can be complicated due to one or more of the following effects: (1) kinetic or thermodynamic impediments on cyanide diffusion or on the dissolution of minerals, (2 ...The effect of sulfide minerals on the leaching of gold in aerated ...احصل على السعر